docs: def _fulfill(self, *args, **kwargs):
          """
          Fulfill the condition.
  
          :param args:
          :param kwargs:
          :return: true if the condition was successfully fulfilled, bool
          """
          tx_hash = self.send_transaction('fulfill', args, **kwargs)
          receipt = self.get_tx_receipt(tx_hash)
          return receipt.status == 1